Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 10 - Radical Expressions and Equations - Get Ready - Page 597: 11



Work Step by Step

$Area=120=1/2 \times bh$ $b=3h+6$ $120=1/2 \times (3h+6)(h)$ $240=3h^2+6h$ $3h^2+6h-240=0$ $h^2+2h-80=0$ $(h+10)(h-8)=0$ $h=-10,8$ $h=8$, because height cannot be negative
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